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    <script>
        // 1.绝对值方法
        console.log(Math.abs(1)); //1
        console.log(Math.abs(-1)); //1
        console.log(Math.abs('-1')); //1  隐式转换 会把字符串型转换为数字型
        console.log(Math.abs('pink')); //NaN

        // 2.三个取整方法
        // (1)Math.floor()  向下取整  往最小了取值
        console.log(Math.floor(1.9)); //1
        // (2)Math.ceil()  向上取整  往最大了取值
        console.log(Math.ceil(1.1)); //2
        // (3)Math.round()   四舍五入
        console.log(Math.round(4.5)); //5
        console.log(Math.round(4.4)); //4
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